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\(No Model.)

C. G. SHORT & N; S. KELLOGG. GOLD-AIR BOX.

N0. 361,457. Patented Apr. 19, 1887.

772%258855 i'flrazzfa f3 .UNITED STATES PATENT OFFICE.

CHARLES G. SHORT AND NORMAN S. KELLOGG, OF MILVAUKEE, \VISCON- SIN; SAID KELLOGG ASSIGNOR TO SAID SHORT,

COLD-Al R BOX.

SPECIFICATION forming part of Letters Patent No. 361,457 dated April 19, 1887.

Application filed October 8, 1886. Serial No. 215,668. (No model.)

To all whom, it may concern.-

Be it known that we, CHARLES G. SHORT and NORMAN S. KELLOGG, both of Milwaukee, in the county of Milwaukee, and in the State of Wisconsin, have invented certain new and useful Improvements in Gold-AirBoxes; and we do hereby declare that the following is a full, clear, and exact description thereof. I

Our invention is a cold-air box for heating or ventilating apparatus; and it consists in certain peculiarities of construction, as will be hereinafter described with reference to the accompanying drawings, in which- Figure 1 represents a front elevation of a hot-air furnace in position foruse-and having our improvements applied thereto; Fig. 2, a vertical longitudinal section of the cold-air box; Fig. 3, a transverse section on line as :r, Fig. 2; and Fig. 4, a horizontal section on line y t. Fig. 3. 7

Referring by letter to the drawings, A represents a hot-air furnace, that may beof any desirable construction, and B a cold-air box having its outlet a into the space between the furnace and its casing O.

The cold-air box is divided into two compartments, b c, by means ofa transverse partition, (I, and leading to this box from the upper rooms of a building in which the furnace may be located is a due, D, while at the same time another flue, E, leads from outside the building to said box.

A transverse shaft, F, has its bearings in the fine D, j ust above the wall (I of the cold-air box B, the outer end of this shaft being preferably fitted to a crank or lever, e, and the inner end thereof keyed to a gear-wheel, f, that is arranged to mesh with a similar wheel, 9, on'a shaft, G, the latter having its bearings in the flue E.

lhe shaft F carries a damper or valve, H, and the one, G, a similar fixture, I, these dampers or valves moving in opposite directions whentheshaftsareoperated. Thusthedamper orvalve H being in the position shown by full lines, Fig. 2, communication is established between the flue D and the compartment 1) of the cold-air box B, and the damper or valve I of the fiueEis in theposition indieatedby dotted lines, same figure, to form with the wall (2 a cut-off between this latter flue and said compartment.

The dampers or valves being in the relative positions just described,the air from the rooms witlfwhich the flue D connects finds its way into the space between the furnace A and casing 0, to be again heatedand carried up the fiues K to the various parts of the building, thus keeping up a steady circulation. The air from the rooms being of a much higher temperature than that from the outside, it 1s heated over and over again with but a small expenditure of fuel, thereby keeping the build ing warm during the night, or at such time as it may be unoccupied and the fires banked.

During the day, or at such times as the building may be occupied, the position of the dampers is-readily reversed by a partial revolution of the crank e, and the flue E, leading to the outside air, thereby permitted to dischargeinto the compartment 1) of the box B, the damper H and wall d acting now as a cut-off between this compartment and the flue D, the com partment 0 of said box being connected to a venti- It will be noticed that the dampers or valves are so arranged that they will always assume such position as that one of the air-fiues will be opened to the compartment 1) and the other to the compartment 0 of the cold-air box, and hence it is impossible for the operator to cut off air from the furnace or cause said dampers or valves to assume suchposition, so that air from both dues will discl'large into both compartments at the same time.

' Our invention is principally designed for the furnaces of school-houses and other large buildings not occupied at night, or, in case of churches, only at certain intervals during the day, and by the construction described we are enabled to prevent such buildings from becoming chilled during the unoccupied period,and at the same time effect a saving in fuel, for the reason that a constant eirculationfof hot air is kept upwithout the necessity of heating that from the outside of such buildings.

Our invention is extremely simple in its application and has no complicated parts to get out of order,while at the same time the position of the dampers orvalves may be readily changed by a slight movement of their shaftsand communication established between either of the supply-fines and the compartment in the airbox that leads to the space between the furnace and its casing. The fine that may be cut off from the heating apparatus by the just-described change of the dampers or valves will discharge-its air into the compartment that communicates with the ventilating-flue and a circulation is kept up through both the furnace and the ventilating-flue; or, in other words, when the air from the outside is passing into the furnace, that from the inside is being discharged into the ventilating-flue, and vice versa.

Vhile we have described our invention in connection with hot'air furnaces it is equally applicable to any heating or ventilating apparatus.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. The combination, with a heating or ventilating apparatus, of a cold-air box that communicates with the air-space ofsaid apparatus, and an inside air-flue and an outside air-flue communicating with said box,adampcrlocated in each fine, and means, substantially as described, for simultaneously operating the dampers in opposite directions, as and for the purpose set forth.

2. The combination,with a heating and ventilating apparatus, of a cold-air box divided into two compartments, one of which communicates with the air-space of said apparatus, an inside air-flue and an outside air-flue communicating with said box, a damper located in each fine, and means, substantially as described, for simultaneously operating the dampers in opposite directions, as and for the purpose set forth.

3. The combination, with a heating or ventilating apparatus, of a cold-air box divided into two compartments, one ofwhich communicates with the air-space of said apparatus, a ventilating-flueleadingiuto the other compartment of the box, an inside air-flue and an outside air-flue communicating with said box, a damper located in each of the latter fines, and means, substantially as described, for operating the dampers in opposite directions, as and for the purpose set forth.

4. The combination, with a heating or ventilating apparatus, of a cold-air box' divided into two compartments, one of which communicates with the air-space of said apparatus, an inside air-flue and an outside'air-flue communicating with said box,and shaftsjournalcd in the respective ilues, each shaft carrying a damper and having one of its ends provided with a gear-wheel, said gear-wheels being arranged to mesh one with the other, whereby a rotation of the shafts will operate both dam pers in opposite directions, substantially as and for the purpose set forth.

In testimony that we claim the foregoing we have hereunto set ourhauds, at Milwaukee, in the county of Milwaukee and State of \Viseonsin, in the presence of two witnesses.

CHARLES G. SHORT. NORMAN S. KELLOGG.

Wit nesses:

If. G. Uxnnnwoon, N. E. OLIPHANI. 

